中文摘要：

采用宏微观耦合有限元模型和子模型技术研究了Si CP/6061Al复合材料微观结构对其力学性能的影响。宏微观耦合有限元模型是由宏观模型和复合材料微观结构模型组成。子模型分析技术是进一步细化复合材料微观结构有限元模型,并把该复合材料微观结构有限元模型边界位移施加到子模型上进行分析计算,子模型分析技术可提高计算准确性及效率。结果表明：增强颗粒形状对该复合材料弹性力学性能几乎没影响,但随增强颗粒角度尖锐化,该复合材料应变硬化效果和应力集中显著增强。颗粒团簇导致了Si CP/6061Al复合材料中应力-应变分布的不均匀,且易失效。随增强颗粒体积分数的增加,该复合材料强度增强。

英文摘要：

The micro-macro unified model and sub-model analysis technique were used to study the effects of microstmcture on the mechanical properties of SiCp/6061A1 composite. The micro-macro unified model consists of a macro-scale model and a microstructure-based model. The sub-model analysis technique was used to refine the grids of the microstructure-based model, and the boundary displacement of the r results show that, when the reinforced particles have regular shape （ and stress concentrate in SiCp/6061Al composite gradually decrease. was applied on the sub-model. The -circle）, the strengthening effect The particle elusters in SiCp/6061Al composite result in the uneven distribution of stress and strain, which can lead to severe material damage. With the increase of particle volume fraction, the strength of the composite increases due to the grain refinement and the dislocation interaction in the matrix.